JPS6146328A - Production of cylindrical member with flange - Google Patents

Abstract

PURPOSE:To reduce a production stage and number of parts and to elevate an accuracy by forming a flange with a upsetting work of the bulged part after a bulging of the bulging part from the pipe material to be worked. CONSTITUTION:A low melting point alloy 17 is charged in the pipe material to be worked with molten condition and solidified. A bulging formation forming an axial symmetrical bulging part 10a is then performed with compressing in axial direction the upper and lower ends 10b, 10b of the pipe material 10. The alloy 17 of the inside of the pipe material is melted and discharged and a nearly oval plate shaped flange 15 is formed with performing a upsetting work along the axial direction of the pipe material of the bulging part 10a, also the original form part of the upper and lower ends 10b, 10b, of the pipe material 10 are respectively made as a cylindrical part 16. The correction of the inside of the cylindrical part 16 and the flange 15 is performed then by a press and a taper face is formed on the hole 16a of each cylindrical part 16. A serration 12 is formed to the hole 16a and on the other hand fitting holes 13, 13 are provided, and the flange 15 is formed in hexagonal plate shape and separated into a pair of products 14, 14 with separating the connecting part of the both ends of the flange simultaneously. A pair of products 14, 14 are thus produced simultaneously.

Description

[Detailed Description of the Invention] Gensu Public Corporation The present invention relates to a method for manufacturing a flanged cylindrical member, and more specifically to a method for integrally manufacturing a flanged portion and a cylindrical member. The cylindrical member is used in various places, for example, as shown in FIG. 7, in a steering wheel of an automobile, when a wheel ring 6 is connected to a steering shaft (not shown) through spokes 4. used for. That is, the flange 3 is welded to the thick cylindrical portion 5 connected to the steering shaft as shown at 8 in FIG. 8, and the spokes 4 are welded to the flange 5.

However, in the thick-walled cylindrical member with flanges of the above structure, the flanges and the thick-walled cylindrical parts are manufactured separately and then welded together, which makes the manufacturing and installation work complicated and increases costs. In addition, there was a problem in that the thick cylindrical portion was distorted due to the heat during welding, resulting in poor mounting accuracy.

To solve this problem, there is a device in which the thick cylindrical portion and the flange are integrally formed by drawing from a plate material.

However, according to this method, at the boundary between the flange and the cylindrical part, it is necessary to make the wall thickness of the cylindrical part larger than the wall thickness of the flange to ensure sufficient strength; There are problems in that it is difficult to control the dimensions and the strength of the boundary portion is insufficient.

In addition, there is a method of integrally forming the material without welding by compression processing from plate materials or hollow materials, but there are certain limits to compression processing, and the compression process requires a high There were problems in that it was necessary to apply a load and a large capacity equipment was required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a method for manufacturing a flanged cylindrical member in which a flange portion is made to bulge out from the cylindrical body by bulb forming.

In order to achieve the above object, the present invention provides a
) The bulging portion was formed into a bulge, and then the bulging portion was crushed to form a collar portion. That is, a step of filling and solidifying a filler material such as a low melting point alloy, a filling liquid, etc. into the pipe material to be processed; and compressing the pipe material filled with the filler material in the axial direction so that the axial center portion of the pipe material is a balno forming step of forming a bulging portion by bulging outward in the radial direction;
A step of discharging the filler in the pipe material from the inside of the pipe material; A step of crushing the bulging part of the pipe material in the axial direction of the pipe material to form a flange; Shaping the inside of the pipe material (inside the cylindrical part) The process was such that the steps of separating the connecting portion at the end of the flange and separating the products into two products were performed sequentially.

In the present invention, in the process of separating the connecting portion of the flange 4, a ceresian a may be simultaneously formed inside the tube and a mounting hole may be formed in the flange.

According to the above configuration, the welding process is completely eliminated, and there is no distortion due to welding heat, improving accuracy. In addition, the flange and the cylinder can be integrally manufactured as one component, reducing the number of manufacturing steps. , the number of parts is also reduced.

In addition, while the end of the tube is made into a cylindrical portion, the flange is formed by bulging out from the center in the axial direction of the tube, so the thickness of the cylindrical portion is inevitably larger than the thickness of the flange. Sufficient strength is always obtained at the boundary between the part and the flange, and reliability is also improved.

Mainly, since the bulging part is formed from the pipe material by valve forming, the compressive force applied to both ends of the pipe material due to the alloy filled inside the pipe material acts almost evenly on the center part of the pipe material, and the bulging part can be formed evenly, resulting in quality In addition to being stable, the compression force does not need to be very large, and the equipment capacity can be reduced.

Furthermore, since two products (flange-equipped tube members) can be manufactured simultaneously from - number of processed tube materials, manufacturing efficiency is greatly improved and costs can be reduced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on illustrated embodiments.

The method of manufacturing the flanged cylinder member for this implementation is as follows: 1.
Two products 14.14 are simultaneously manufactured from one pipe material 10 to be processed.

That is, in the first step, a molten alloy 17 having a lower melting point than the tube material is filled as a filler into the tube material 10 shown in FIG. 1(a) and solidified.

Next, in the second step, FIG. 1(b) and FIG. 2(a)
As shown in , the upper and lower ends iob, iob of the tube material 10 filled with the alloy 17 are compressed in the axial direction by a press, and the center portion of the tube material 10 in the annular direction is bulged outward in the radial direction and in opposite directions. In other words, as shown on the left side of the line A-A in FIG. Insert the lower half, support it on the upper surface of the lower punch 21, lower the upper die 22, bring it into close contact and pressure contact with the lower die 20, and insert the tube material 10 into the fitting hole 22a of the upper die 22.
Fit the upper half of the Then, the fitting hole 22 of the upper die 22
After bringing the upper punch 23 in a into contact with the upper surface of the pipe material 10,
Move the upper and lower punches 23 and 21 so as to compress them in the axial direction of the tube. As a result, Fig. 3 A-AJ! As shown on the right side of it, the compressive force applied to the tube material 10 acts to cause the central portion of the tube material in the glaze direction to bulge outward in the radial direction due to the alloy 17, so that the concave portion 20b for forming the bulge portion of the upper and lower dies 20.22, 2
2 [+ A U-shaped bulge 10a in cross section symmetrical with respect to the tube axis
form. After the bulge is formed, the upper and lower punches 21 and 23 are respectively retreated to their original positions shown on the left side of line A-A, and
The upper die 22 rises relative to the lower die 20, and the bulged portion 1
0a is discharged from the lower guide fitting hole 24a. In addition, the fitting hole 22a of the upper and lower gougers 22.20,
A drawing taper is provided on the inner circumferential surface of each tube 20a so that the tube material 10 can be easily discharged.

Next, in the third step, the alloy 17 inside the tube is melted and discharged from the tube.

Next, in the fourth step, as shown in FIG. 1(c) and FIG. 2(b), the bulging portion 10a of the tube material 10 is flattened by crushing it with a press along the tube material transport direction. While forming the disk-shaped collar part 15, the upper and lower ends 10 of the tube material 10
The original portions b and 10b are respectively designated as cylindrical portions 16. That is, as shown on the left side of the line B-B in FIG.
The pipe material 10 is passed through the mandrel 26 that has been made. Then, as shown on the right side of the line B-B in FIG. The portion 10a is crushed between it and the die upper surface 24b. After processing, while the punch 27 rises, the ejector 25
The stiffened tube material 10 is discharged from the die 24.

Next, in the fifth step, as shown in FIG. 1(d) and FIG. 2(c), the inside of each cylindrical portion 16 and the flange 15 are corrected by pressing, and the hole 16a of each cylindrical portion 16 is tapered. form a surface. That is, as shown on the left side of the line CC in FIG. 5, the lower cylindrical portion 16 of the tube material 10 is fitted into the fitting hole 29a of the die 29. Then, the guide member 32
9 , and the upper cylindrical portion 16 of the tube member 10 is fitted into the fitting hole 32 a of the side member 32 . Furthermore, the upper punch 34 is inserted into the hole 16a of the upper cylindrical portion 16 of the tube material 10, which is restrained by the die 29 and the id member 32, and the upper bunch 34 and the id member 32 are lowered.
As shown on the right side of the line C-C in FIG. Upper and lower punches 34.31 are pushed into the holes 16a, 16a of 16.16 to straighten each cylindrical portion 16 and flange 15, and at the same time form a tapered surface in the hole 16& of each cylindrical portion 16. After processing, raise the id member 32 and upper punch 34, and lower the upper and lower ejectors 33.3.
0, the tube material 1o is discharged from the id member 32, the die 29, and the upper and lower punches 34 and 31.

Next, in the sixth step, as shown in FIG. 1(e) and FIG. 2(d), a serration 12 is formed in the hole 1i of each cylindrical portion 16, and a pair of serrations are formed in the vicinity of the cylindrical portion of the collar portion 15. At the same time, the flange 15 is formed into a hexagonal plate shape as shown in FIG. 2(e), and the connecting portions 15a at both ends of the flange.

15a is separated into a pair of products 14 and 14 as shown in FIG. 1(f). That is, as shown on the left side of line D-D in FIG.
At the same time, the movable die 34 is lowered to the fixed die 33 side, and the first punch 40 of the movable die 34 is inserted into the hole 16a of the upper cylindrical portion 16 of the tube material 10. , a spring 37. below the punch support plate 38 fixed around the base of the first punch 40. . . , the upper cylindrical portion 16 of the tube material 10 is fitted into the recessed portion 36b of the punch guide 36 biased by 37. Further, when the movable die 34 descends, the serration forming portion 40a at the lower end of the first punch 40 forms the holes 16a, 16a in the upper and lower cylindrical portions 16.16.
Form serrations 12.12 inside. On the other hand, when the punch support base 38 descends, the lower surface 9G6 of the para-4f tile and the flange 15 are held between the upper surface 33b of the fixed die, and the pair of second punches 39 and 39 descend to the flange 15. At the same time, the trim punch 35 is also lowered to form the flange 15 into a hexagonal plate shape, and the connecting portions ISa at both ends of the flange are cut off. After processing, the movable gouer 34 is raised, and the mounting hole 13.13 engages with the second punch 39.39, and the product 14°14, which had been lifted above the fixed die 33, is moved to the second punch 39.39.
is spring 37.・、・.

Hole 36a of punch guide 36 due to downward biasing force of 37
By being stored inside and falling downward, the movable guide 3
It is also discharged from 4.

Therefore, by sequentially performing the above steps, a pair of products 14
．． 14 are manufactured simultaneously at one time.

According to the above embodiment, the flange portion 15 and the cylindrical portion 16 can be integrally manufactured as one component, reducing the illumination process and the number of parts, and eliminating the welding process, which prevents distortion due to welding heat. Therefore, accuracy can be improved.

Further, while the end portion 10b of the tube material 10 is the cylindrical portion 16,
Since the flange portion 15 is formed from the bulged portion 10a that bulges out from the central portion in the axial direction of the tube, the thickness of the cylindrical portion 16 is inevitably larger than the thickness of the flange portion 15, and the cylindrical portion 16 and the flange Sufficient strength is always obtained at the boundary of the portion 15, and reliability is also improved.

In addition, since the bulging portion 10a is formed from the tube material 10 by bulge forming, the compressive force applied to both ends of the tube material by the alloy 17 filled inside the tube material acts almost equally on the center portion of the tube material, and the bulge portion 10a is formed evenly. The quality is stable, the compression force does not need to be very large, and the equipment capacity can be reduced. Furthermore, by making the longitudinal dimension of the flange 15 three times or more the outer diameter of the cylindrical portion 16, it is possible to manufacture a flange 15 that is lightweight and can sufficiently save space for mounting other members.

Furthermore, two products (
Since the flanged cylinder member) 14.14 can be manufactured, manufacturing efficiency is greatly improved and costs can be reduced.

Note that the present invention is not limited to the above embodiments,
For example, the cylindrical part is not limited to a cylindrical shape, but may be a rectangular cylindrical shape, and the flange part 1
5 may also be formed asymmetrically with respect to the tube axis.

[Brief explanation of the drawing]

FIGS. 1(a) to (f) are cross-sectional explanatory diagrams showing steps of a manufacturing method according to an embodiment of the present invention, and FIGS. 2(a) to (c) are
Plan views of Figures 1 (1,) to (f) and 3 to 6, respectively.
The figures are cross-sectional views of the manufacturing equipment in each manufacturing process.
FIG. 8 is a plan view of a steering wheel having a conventional flanged cylindrical member and a cross-sectional side view of the cylindrical member. 10... Pipe material to be processed, 12... Serration, 13
...Mounting hole, 14...Product (tubular member with flange), 15.
...Brim part, 16...Cylindrical part.

Claims (1)

[Claims] (1) A step of filling and solidifying the filler into the pipe material to be processed; axially compressing the pipe material filled with the filler material so that the center portion of the pipe material in the annular direction bulges outward in the radial direction; a bulge forming step of forming a bulging portion; a step of discharging the filler in the tube material from the inside of the tube material; a step of crushing the bulge portion of the tube material in the axial direction of the tube material to form a flange portion; A method for manufacturing a flange-equipped cylindrical member, comprising sequentially performing the following steps: forming the inside of the tube; and separating the connecting portion at the end of the flange.